The hire vs agency decision is one of the most consequential team-building choices in growing ecommerce. Get it right and you build durable in-house capability. Get it wrong and you either burn cash on agency premiums or hire too early into roles you can\'t support. The dollar math is one factor; ramp time, retention risk, and management capacity are the other three.
This calculator computes the dollar comparison: agency monthly retainer × 12 vs in-house fully-loaded annual cost (base salary × 1.30-1.40 multiplier + tools + recruiting amortization). The model includes an output multiplier — a competent in-house hire often produces 20-50% more output than an equivalent-cost agency because integration and ownership scale better than retainer hours.
The strategic insight: hire when you can support the role with management attention and retention investment. The in-house savings only materialize if the hire stays 18+ months. If your team can\'t onboard, manage, or retain mid-level marketing talent, agency is safer despite the cost premium. Most successful operators run a hybrid model — in-house senior strategist managing 1-2 agency relationships for execution depth — once revenue exceeds $5M annually.
Pair with the Cash Flow Runway calculator (validate hiring against runway), Profit Reinvestment Modeler (where the savings get redeployed), Q4 Planning Readiness (seasonal staffing decisions), and Tech Stack Audit calculator (tools that scale headcount efficiency). Most successful hires happen at the $8-15K agency-spend tier per discipline — below that, agency is cheaper; above $15K, in-house almost always wins.
Frequently asked questions
When is in-house cheaper than agency?
Once you're paying $8-12K/month for agency services in a single discipline (paid social, email, SEO). At that retainer level, hiring a mid-level specialist ($75-110K fully loaded) typically beats agency on cost while gaining tighter integration. Below $8K/month agency, the in-house overhead exceeds savings.
What's the fully-loaded cost of a hire?
Salary × 1.30-1.40 typical. So $80K base salary = $104-112K fully loaded (taxes, benefits, equipment, software seats, recruiting cost amortized). Plus $5-15K of ramp cost (lower productivity in first 60-90 days while learning).
Agency vs hybrid — what's the right answer?
Hybrid often wins. Hire a senior strategist in-house ($90-150K) who manages strategy + 1-2 agency relationships for execution depth. Get the strategic ownership of in-house plus the breadth of agency experience. Pure-agency: lacks ownership. Pure-in-house: lacks breadth at smaller team sizes.
How long does the hire pay off?
Break-even versus equivalent agency typically lands at month 4-8. Months 1-3 are net negative (ramp). Months 4-12 the hire usually outperforms the agency on cost-per-output. Year 2+, the hire is meaningfully cheaper if retention works. The wildcard: turnover. If the hire leaves at month 14, you essentially paid agency rates anyway.
When should I never hire in-house?
For specialized one-time projects (website redesign, brand identity), niche skills you don't need 40 hours/week of (legal, complex SEO audits), or markets you're testing without commitment. Anything you'll do for under 6 months should be agency or contractor, not hire.